OOP- Prophesy - Paradox or foreshadowing?

[medeacallous]

No: HPFGUIDX 62112

Ok, correct me if I'm wrong in my understanding of the prophesy:  

It seems to me that one of two things is true of the prophesy - 
either it is a paradox, or a foreshadowing of something that JKR 
hasn't even touched on.

Here's the thing:  If the 'unknown powers' that the prophesy speaks 
of in Harry are a result of Lily's sacrifice, or of the transfer of 
power that came as a result of Voldemort's attempt to kill him, then 
it's a total paradox, because if the prophesy had never been made, 
or even never partially overheard, Voldemort would have never taken 
the step to identify Harry and Neville, choose between the two of 
them, and go after Harry.  In which case, Harry would have grown up 
without the protection of Lily's sacrifice, without the 'mark', and 
without the powers transferred to him at the moment of Voldemort's 
rebounded curse.

So... is there something about Harry, some power, that derives  
neither from Lily's sacrifice nor Voldemort's murder attempt?

Any ideas?

MC